Multipart cooled piston for a combustion engine and method for manufacture thereof

US6691666B1 · kind B1 · utility

Assignees

• Mahle GmbH · DE
• Volvo Powertrain Aktiebolag · SE
• HIRSCHVOGEL UMFORMTECHNIK GMBH · DE

Inventors

• Gerhard Berr · Aspach, DE
• Armin Ihle · Asch, DE
• Henk Ravenshorst · Svenljunga, SE
• Magnus Horn · Baharka, IQ
• Lars Lundin · Porvoo, FI

Key dates

• Filing date: Jan 22, 2003
• Grant date: Feb 17, 2004
• Expiry date: Jan 22, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02F3/22
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a multipart cooled piston (20) for a combustion engine with a piston upper part (1) of steel comprising a combustion bowl (3) and a ring wall (4) with ring belt (11), and with a piston lower part (2) comprising a piston skirt (9), pin bosses (12) for receiving the piston pin connecting the piston (20) to the connecting rod, and pin boss supports (6) connected to the piston skirt (9), and in a method for manufacture of such a piston (20), inexpensive manufacture and good form stability are to be achieved in that a cooling channel (7) formed inside the piston upper part (1) has forged supporting ribs (8) in its area extending to the combustion bowl (3), which each form sections of an all-round ring rib (5) with a connection surface radially to the longitudinal piston axis (K), in that the piston lower part (2) has an annular and all-round carrier rib (10) with a connection surface connected to the pin boss supports (6), and in that the piston upper part (1) and the piston lower part (2) are non-detachably connected by means of the connection surfaces of the ring rib (5) and the carrier rib (10).